All the Perl that's Practical to Extract and Report

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Yeah, I think this highlights why bayesian analysis is better than rule based approaches. It's harder to tweak the message so it slips by. Also, it's my understanding that bogofilter can scaled much better on a high volume MTA than SpamAssasin...but I don't know this for a fact so perhaps I should keep quiet.

BTW, it is also important to reduce server load if you try implementing some automated way to handle spam.

I've been thinking about writing something that will be run from an alias such as $USER-spam and $USER-ham (it will have to check the origin of the message: only the user himself can send messages to these addresses) and will classify the message as one of those using the user's database. Then, procmail or some other thing can compare messages against that database and add a header. The user will have to create the filtering rules on his MUA.

It will help a lot and the user will have some way to interact with the program using only email.